feat(layers): add FAA drone restrictions airspace layer

Show US prohibited and restricted special-use airspace from the keyless
FAA SUA FeatureServer as an off-by-default Infrastructure layer, with
share-link token 3 and an informational-only disclaimer.

package.json

@@ -165,6 +165,7 @@
     "./layers/recent-imagery": "./src/layers/recentImagery/index.js",
     "./layers/recent-imagery/source": "./src/layers/recentImagery/source.js",
     "./layers/perimeters": "./src/layers/perimeters/index.js",
+    "./layers/drone-airspace": "./src/layers/droneAirspace/index.js",
     "./sources/firms-csv": "./src/data/firmsCsv.js",
     "./layers/firms": "./src/layers/firms/index.js",
     "./layers/satellites": "./src/layers/satellites/index.js",
@@ -238,6 +239,7 @@
     "./layers/cctv/source": "./src/layers/cctv/source.js",
     "./layers/earthquakes/source": "./src/layers/earthquakes/source.js",
     "./layers/perimeters/source": "./src/layers/perimeters/source.js",
+    "./layers/drone-airspace/source": "./src/layers/droneAirspace/source.js",
     "./layers/firms/source": "./src/layers/firms/source.js",
     "./layers/installations/source": "./src/layers/installations/source.js",
     "./layers/launches/source": "./src/layers/launches/source.js",